Remove codecov (#3615)

* remove codecov from CI, also remove circleci tests as we run these somewhere else now already.

* leaving an empty test step for now

.circleci/config.yml

@@ -48,13 +48,6 @@ jobs:
     <<: *defaults
     steps:
       - checkout
-      - run:
-          name: Unit Tests
-          command: make BUILD_IN_CONTAINER=false test
-      - run:
-          name: Upload Codecov
-          command: |
-            bash <(curl -s https://codecov.io/bash)
 
   # Promtail
   build/promtail-windows:

README.md

@@ -4,7 +4,6 @@
 <a href="https://circleci.com/gh/grafana/loki/tree/master"><img src="https://circleci.com/gh/grafana/loki.svg?style=shield&circle-token=618193e5787b2951c1ea3352ad5f254f4f52313d" alt="CircleCI" /></a>
 <a href="https://goreportcard.com/report/github.com/grafana/loki"><img src="https://goreportcard.com/badge/github.com/grafana/loki" alt="Go Report Card" /></a>
 <a href="https://slack.grafana.com/"><img src="https://img.shields.io/badge/join%20slack-%23loki-brightgreen.svg" alt="Slack" /></a>
-<a href="https://codecov.io/gh/grafana/loki"><img src="https://codecov.io/gh/grafana/loki/branch/master/graph/badge.svg" alt="Codecov" /></a>
 
 # Loki: like Prometheus, but for logs.